Sectional sofa



FIG. 1 is a perspective view of a sectional sofa showing our new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a left rear elevational view; and,

FIG. 4 is a right rear elevational view.

The portion shown in the broken lines in the drawings forms no part of the design being claimed. 

The ornamental design for a sectional sofa, as shown and described. 